Hi Christian,
Just a gentle reminder.
The MDIO frequency config is already added by the following patch series.
https://lore.kernel.org/netdev/28c8b31c-8dcb-4a19-9084-22c77a74b9a1@xxxxxxxxxx/T/#m840cb8d269dca133c3ad3da3d112c63382ec2058
I admit this version was posted first. However, its embedded in a
patch series which is not making much progress, and i doubt will make
progress any time soon.
If you really want your version to be used, please split it out into a
standalone patch series adding just MDIO clock-frequency support, with
its binding, and nothing else.
Andrew